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    Introduction To RGP

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    Mossab Omair
    Gas permeable (GP) contact lenses, also known as rigid gas permeable lenses (RGP), are rigid plastic lenses that allow oxygen to pass through. They are an alternative to soft contact lenses. GP lenses are suitable for conditions like keratoconus, irregular corneas, high refractive errors, and astigmatism. Compared to soft lenses, GP lenses provide better oxygen delivery, vision, comfort, and hygiene. However, they require consistent wear to maintain adaptation and can slip more easily than soft lenses. The document discusses fitting philosophies, tips, advantages, and disadvantages of GP lenses. It recommends GP lenses as an effective option for clearer vision, reduced complications, and corneal reshaping compared to soft

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    Introduction To RGP

    Uploaded by

    Mossab Omair
    403 views17 pages
    Gas permeable (GP) contact lenses, also known as rigid gas permeable lenses (RGP), are rigid plastic lenses that allow oxygen to pass through. They are an alternative to soft contact lenses. GP lenses are suitable for conditions like keratoconus, irregular corneas, high refractive errors, and astigmatism. Compared to soft lenses, GP lenses provide better oxygen delivery, vision, comfort, and hygiene. However, they require consistent wear to maintain adaptation and can slip more easily than soft lenses. The document discusses fitting philosophies, tips, advantages, and disadvantages of GP lenses. It recommends GP lenses as an effective option for clearer vision, reduced complications, and corneal reshaping compared to soft

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    Introduction to RGP

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    Gas permeable (GP) contact lenses, also known as rigid gas permeable lenses (RGP), are rigid plastic lenses that allow oxygen to pass through. They are an alternative to soft contact lenses. GP lenses are suitable for conditions like keratoconus, irregular corneas, high refractive errors, and astigmatism. Compared to soft lenses, GP lenses provide better oxygen delivery, vision, comfort, and hygiene. However, they require consistent wear to maintain adaptation and can slip more easily than soft lenses. The document discusses fitting philosophies, tips, advantages, and disadvantages of GP lenses. It recommends GP lenses as an effective option for clearer vision, reduced complications, and corneal reshaping compared to soft

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    403 views17 pages

    Introduction To RGP

    Uploaded by

    Mossab Omair
    Gas permeable (GP) contact lenses, also known as rigid gas permeable lenses (RGP), are rigid plastic lenses that allow oxygen to pass through. They are an alternative to soft contact lenses. GP lenses are suitable for conditions like keratoconus, irregular corneas, high refractive errors, and astigmatism. Compared to soft lenses, GP lenses provide better oxygen delivery, vision, comfort, and hygiene. However, they require consistent wear to maintain adaptation and can slip more easily than soft lenses. The document discusses fitting philosophies, tips, advantages, and disadvantages of GP lenses. It recommends GP lenses as an effective option for clearer vision, reduced complications, and corneal reshaping compared to soft

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 17

    Gas Permeable Lenses

    Mossab Omair
    Consultant Optometrist
    CLGEI
    • Have you heard about RGP lenses?
    • Have seen a RGP lens fitting or Fitted a
    patient with RGP lenses or ever inserted &
    removed a GP lenses into patients eye or
    your own eye?
    • What are the indications or conditions
    where a patient can be or should be
    fitted with a GP contact lenses

    • And Why GP lenses?


    • Rigid gas permeable (RGP) contact lenses were first
    made available in 1979 as an alternative to the soft
    lens.
    • Gas permeable contact lenses are rigid lenses made
    of durable plastic that transmits oxygen.

    • These lenses also are called GP lenses, rigid gas


    permeable lenses (RGP) and Gas (oxygen)
    permeable lenses
    • As RGPs have become ever softer, the tendency in optometry schools
    at the present moment is to discourage the use of the term 'rigid' gas
    permeables in favour of 'gas permeables'.
    Patients who benefit from GP lenses
    • Keratoconus
    • Keratoglobus
    • PMCD, TMCD
    • Patients with irregular corneal disorders such
    as
    • Salzmann’s, ectasia, and other dystrophies, Scars
    • Patients with high refractive error
    • Patients with high amounts of astigmatism
    Optics – The Tear Lens
    • Tear lens under a flexible lens is very thin
    and has no power
    • Tear lens under a rigid lens depends on
    material rigidity and the fitting relationship
    • If a rigid lens decenters, the tear lens will
    acquire a prismatic component
    Tear Lens
    What you will be needed
    Fitting Philosophies
    RGP fitting Tips
    • Toric back surface lenses rarely work (non-orthogonal astigmatism)
    • Consider toric peripheral curve design if axial edge clearance is
    inconsistent around lens edge
    • Modification of peripheral curve is often required
    • BVP not determinable empirically (use over-Rx on a trial lens)
    • Correct any residual cylindrical Rx with over-spectacles
    • Review patient regularly (e.g. 3-monthly in early stages of care)
    • Look for 3 & 9 o’clock and central punctate staining
    • Consider fenestrations for ↑ tear exchange
    Advantage
    1. Good oxygen delivery
    2. Better Vision
    3. Health and Hygiene Benefits
    4. Comfortable to wear
    5. Easy to put on and care for
    6. Relatively long life
    7. Available for myopia control and corneal
    refractive therapy
    8. Cost
    Disadvantage
    1. Require consistent wear to maintain adaptation
    2. Can slip off center of eye more easily than other types
    3. Initial discomfort
    Why we Should go for GP lenses:
    • GP lenses are an effective route to better vision and long-term
    comfort, as well as reduced risk of sight-threatening complications.1
    • For those with astigmatism and presbyopia firmer GP lenses tend to
    provide clearer, crisper vision than soft lenses.
    • And, for patients with keratoconus and irregular corneas this may be
    their only option for clear vision.
    • Corneal reshaping as a viable alternative to refractive surgery.

    1. Gill FR. Turning the tide for gas permeable contact lenses. Cardiff University. 2010. orca.cf.ac.uk/54980/1/U585369.pdf.
    Accessed August 4, 2017.
    I do it for two reasons

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